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Car WheehfV Patented .lune i6, 1868.

W. R. THOMAS, OF OATASAUQUA, PENNSYLVANIA.

Letters Patent No. 79,029, dated June 16, 1868.

IMPROVED GAR-WHEEL.

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TO ALL WHOM IT MAY CONCERN:

Beit known that I, W. R. THOMAS, of Oatasauqua, in the county of Lehigh,and State of Pennsylvania, have invented new and useful Improvements inCar-Wheels; and I do hereby declare that the following is a full, clear,and exact description thereof, which will enable others skilled in thea'rt to make and use the saine, reference being had to the accompanyingdrawings, forming part of this specification.

My invention relates to improvements in car-wheels made o'f cast metal,whereby it is designed to provide a. more durable Wheel, and which isless liable to be a'ected by unequal contraction or Vexpansion than anynow in use.

And it consists in a more improved form` of' the wheel, whereby themetal is disposed in a manner better` calculated to seeure the aforesaidobjects, as will be more fully described on reference tothe'aceompanying drawings, wherein Figure 1 represents a side elevationot' my improved wheel, and

Figure 2 a section on the line a: :r of iig. 1.

Similar letters of reference indicate corresponding parts. l

4In casting my improved wheel, I arrange the mould and provide a core soas to form a hollow enlargement aroundthe hub, as shown at A, and hollowarms, B, communicating with the said hollow enlargement, and runningoutward to the tread, and a thin webbing of metal between the said arms,also connecting with the rim and the said enlargement;

I have foundhvery great advantages resulting from the above-desribeddisposition of the metal of castmetal wheels, in the respect of greatstrength, and `freedom from liability to crack from unequal contractionand expansion in cooling, when cast. Y

I claim as new, and desire to seeure by Letters Patent A cast-metaloar-wheel, provided with the hollow enlargement A, hollow arms B,communicating with the.

same, and the in-turning thin metal webbing, all constructed andarranged substantially as and for the purpose described. i

The above specification of my invention signed by me, this 20th day ofMarch, 1868.

V W. R. THOMAS.

Witnesses;

J. W. FULLER, Jr., R. CLAY HAMERSLY.

